Screen Rotation Help

So I’m finally building the mirror I’m gifting next Sat and need to change display to portrait. The threads I’ve seen have been on older versions of the software. Has anything changed since the new version? What’s the easiest way to do this?

I’m using a 3b+.

I read something about MMM-RemoteControl being wonky if you do this. Any help for clueless dude would be awesome